JPH0742737A - Superconductive magnetic bearing device - Google Patents

Abstract

PURPOSE:To provide a superconductive magnetic bearing device which can improve radial rigidity of a superconductive bearing for supporting a rotary main shaft. CONSTITUTION:A superconductive magnetic bearing is constituted by adding a radial bearing constituted of second superconductive body 32a, 32b for matching the radial direction with c axial direction, and second permanent magnet 34a, 34b, to an axial bearing constituted of first permanent magnet 23a, 23b and superconductive body 21a, 21b, and then a rotary main shaft 5 is rotated by rotational driving of a motor rotor 7 caused by driving a motor stator 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a superconducting magnetic bearing device, and more particularly to a superconducting magnetic bearing device that supports a rotating main shaft by making a superconductor and a permanent magnet face each other in a non-contact manner.

[0002]

2. Description of the Related Art Superconductors have a Meissner effect and a pinning effect below a critical temperature. The Meissner effect refers to perfect diamagnetism of a superconductor, and the pinning effect refers to a force that fixes a magnetic field in the superconductor. A superconducting magnetic bearing device has been developed which holds a rotating main shaft in a non-contact manner by making a superconductor having these two effects and a permanent magnet face each other.

A conventional superconducting magnetic bearing device using an oxide high temperature superconductor as the superconductor will be described below.

FIG. 4 is an axial sectional view of a first conventional superconducting magnetic bearing device, and FIG. 5 is an axial sectional view of a second conventional superconducting magnetic bearing device.

Referring to FIG. 4, disk-shaped permanent magnets 3a and 3b are attached to both axial ends of a rotary spindle 5 housed inside a housing 11 surrounding the apparatus. The disc-shaped superconductor 1 is formed on the inner surface of the upper and lower parts of the housing 11 so as to face the attached permanent magnets 3a and 3b.
a and 1b are attached. A motor rotor 7 is attached to the outer diameter side surface of the rotating main shaft 5, and a motor stator 9 is attached to the inner surface of the housing 11 so as to face the motor rotor 7.

Next, the operation of the apparatus will be described. First,
By cooling the superconductors 1a and 1b to a critical temperature or lower using a refrigerant or the like, the rotating spindle 5 is held in a non-contact state by the Meissner effect and the pinning effect of the superconductors 1a and 1b. Further, by driving the motor stator 9 mounted on the housing 11, the motor rotor 7 mounted on the rotary main shaft 5 is rotationally driven, so that the rotary main shaft 5 can be rotated.

Thus, the disk-shaped superconductors 1a and 1b
The superconducting magnetic bearing device in which the and the disk-shaped permanent magnets 3a and 3b face each other on a flat plate is structurally simple. However, when the rotating main shaft 5 is rotated, since the radial rigidity of the superconducting magnetic bearing is small, the rotating main shaft 5 swings largely due to unbalance of the rotating main shaft 5 or external disturbance such as a motor. Therefore, in order to increase the radial rigidity of the superconducting magnetic bearing, there has been proposed a superconducting magnetic bearing device having a radial bearing composed of a superconductor and a permanent magnet in the radial direction as shown in FIG.

Referring to FIG. 5, ring-shaped superconductors 21a and 21b are provided on the inner surfaces of the upper and lower portions of the housing 11.
Is installed. This attached superconductor 21a, 2
Ring-shaped permanent magnets 23a and 23b are attached to the rotary main shaft 5 so as to face the shaft 1b in the axial direction. Also,
Cylindrical permanent magnets 24a and 24b are attached to the rotating main shaft 5 so as to face the superconductors 21a and 21b in the radial direction. Further, similarly to the first conventional device shown in FIG. 4, the motor rotor 7 is attached to the outer diameter side surface of the central portion of the rotary spindle 5.
The motor stator 9 is attached to the inner surface of the housing 11 so as to face the motor rotor 7. Therefore, by driving the motor stator 9,
The motor rotor 7 can be driven to rotate, and the rotating main shaft 5 to which the motor rotor 7 is attached can be rotated.

[0009]

In the second conventional superconducting magnetic bearing device shown in FIG. 5 as described above, the superconductor 2
The thickness direction of 1a and 21b and the axial direction of the main axis of rotation are the same, that is, the superconductors 21a and 21b are c-axis oriented in the axial direction of the main axis of rotation. Electric current easily flows inside. Therefore, compared with the axial rigidity of the axial bearing formed by the superconductors 21a and 21b and the first permanent magnets 23a and 23b in the axial direction of the rotating main shaft, the superconductor 21 in the axial direction of the rotating main shaft can be compared.
The radial rigidity of the radial bearing formed by a, 21b and the second permanent magnets 24a, 24b is small.

Therefore, the present invention is to provide a superconducting magnetic bearing device capable of increasing the radial rigidity of the above radial bearing.

[0011]

The invention according to claim 1 is
A fixed member, a rotating member rotatably provided with respect to the fixed member, a first permanent magnet or a first superconductor attached to the rotating member, and a first permanent magnet or a first superconductor. In a superconducting magnetic bearing device including a first superconductor or a first permanent magnet attached to a fixed member so as to face each other at a predetermined interval, and a drive means for driving a rotating member, in a radial direction of rotation of the rotating member. The second superconductor having the same orientation direction as is attached to the fixed member so as to face the second permanent magnet attached to the rotating member.

[0012]

The superconducting magnetic bearing device according to the invention of claim 1
By matching the orientation direction of the superconductor and the radial direction, the radial rigidity of the radial bearing formed by the superconductor and the permanent magnet can be increased, and the radial runout of the rotating member can be suppressed.

[0013]

1 is an axial sectional view of a superconducting magnetic bearing device according to an embodiment of the present invention, and FIG. 2 is a line II-I in FIG.
It is an expanded sectional view which follows the I line.

Referring to FIG. 1, in the superconducting magnetic bearing device of this embodiment, cylindrical second permanent magnets 34a and 34b are attached to the shaft ends of the rotary main shaft 5, respectively. Further, as shown in FIG. 2, on the inner surface of the housing 11 so as to face the second permanent magnets 34a, 34b, the block-shaped second superconductors 32a, 32b are arranged in the direction of the c-axis orientation and the rotation main shaft. 5 are aligned in the radial direction, and four are attached each. The other device configurations are the same as those of the conventional example of FIG.

As a result, the second superconductors 32a, 32b
And the second permanent magnets 34a, 34b, the radial rigidity of the radial bearing is the same as that of the superconductors 21a, 21b.
The axial rigidity is increased similarly to the axial bearing composed of the permanent magnets 23a and 23b.

Therefore, when the superconducting magnetic bearing device according to the embodiment of the present invention shown in FIGS. 1 and 2 is driven, whirling of the rotary spindle due to unbalance of the rotary spindle or external disturbance such as a motor is suppressed. be able to.

FIG. 3 is an axial sectional view of a superconducting magnetic bearing device according to another embodiment of the present invention. With reference to FIG. 3, a fixing member 41 having a fixed lower end is provided. Fixing member 4
A rotary spindle 42 is provided so as to surround 1. Spindle 4
A disk-shaped third permanent magnet 45 is provided on the upper part of the inner surface of 2.
A ring-shaped fourth permanent magnet 46 is provided on the lower part of the inner surface, and a cylindrical fifth permanent magnet 47 is provided on the upper part of the side surface.
A cylindrical sixth permanent magnet 48 is provided on the lower portion of the side surface.

A disk-shaped third superconductor 49 is provided at the upper end of the fixing member 41 so as to face the third permanent magnet 45, and a block-shaped fifth superconductor 49 faces the fifth permanent magnet 47. A superconductor 51 is provided. Further, the ring-shaped fourth member is provided on the fixing member 41 so as to face the fourth permanent magnet 46.
A superconductor 50 is provided, and a block-shaped sixth superconductor 52 is provided so as to face the sixth permanent magnet 48. Here, the superconductors 51 and 52 are block-shaped superconductors whose c-axis orientation axes coincide with the radial direction of the rotation main shaft 42.

Further, a motor stator 53 is attached to the fixed member 41, and a motor rotor 54 is attached to the rotating main shaft 42 so as to face the motor stator 53.

As a result, also in this embodiment, the fifth
The radial rigidity of the radial bearing composed of the permanent magnet 47 and the fifth superconductor 51 and the sixth permanent magnet 48 and the sixth superconductor 52 is the same as the third permanent magnet 45, the third superconductor 49, and the fourth superconductor.
It becomes as large as the axial rigidity of the axial bearing composed of the permanent magnet 46 and the fourth superconductor 50.

In the embodiment shown in FIGS. 1 and 2 of the present invention, four superconductors forming the radial bearing are provided in the upper and lower parts of the housing, but the number of superconductors is not limited. .

Further, the superconducting magnetic bearing may be constructed by using a yttrium-based high temperature superconductor or the like for the superconductor attached to the fixed side.

[0023]

As described above, according to the invention of claim 1,
By configuring a radial bearing in which the direction of orientation of the superconductor and the radial direction of the rotating member are matched, the radial rigidity is increased, and whirling of the rotating member can be suppressed. It is possible to prevent damage to the device.

[Brief description of drawings]

FIG. 1 is an axial sectional view of a superconducting magnetic bearing device according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view taken along line II-II of FIG.

FIG. 3 is an axial sectional view of a superconducting magnetic bearing device according to another embodiment of the present invention.

FIG. 4 is an axial sectional view of a first conventional superconducting magnetic bearing device.

FIG. 5 is an axial sectional view of a second conventional superconducting magnetic bearing device.

[Explanation of symbols]

 1a, 1b, 21a, 21b Superconductor 3a, 3b Permanent magnet 5, 42 Rotating main shaft 11 Housing 23a, 23b First permanent magnet 24a, 24b, 34a, 34b Second permanent magnet 32a, 32b Second superconductor 41 Fixing member 45 Third permanent magnet 46 Fourth permanent magnet 47 Fifth permanent magnet 48 Sixth permanent magnet 49 Third superconductor 50 Fourth superconductor 51 Fifth superconductor 52 Sixth superconductor

Claims (2)

[Claims] 1. A fixed member, a rotating member rotatably provided with respect to the fixed member, a first permanent magnet or a first superconductor attached to the rotating member, and the first member.
Of the permanent magnet or the first superconductor, the first superconductor or the first permanent magnet attached to the fixed member so as to face the permanent magnet or the first superconductor at a predetermined interval, and a driving means for driving the rotating member. In the superconducting magnetic bearing device, a second superconductor whose orientation of orientation coincides with a rotational radial direction of the rotating member is attached to the fixed member so as to face a second permanent magnet attached to the rotating member. A superconducting magnetic bearing device. 2. The superconducting magnetic bearing device according to claim 1, wherein the second superconductor includes at least two plate-shaped superconductors, and the first and second superconductors include yttrium-based high-temperature superconductors. .